[PATCH libinput] touchpad: only use negative pressure change check on Lenovo *50 and *60 series

[Peter Hutterer]

This was introduced for bug 94379 - an X1 Carbon 3rd. Other touchpads have
different pressure change ranges, causing this condition to trigger
randomly and resulting in a jerky pointer motion.

For now, reduce the check to the *50 and *60 series touchpads until we have
data for more touchpads that we can add one-by-one.

https://bugs.freedesktop.org/show_bug.cgi?id=95393

Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
---
 src/evdev-mt-touchpad.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/evdev-mt-touchpad.c b/src/evdev-mt-touchpad.c
index 4c8c3a3..c854043 100644
--- a/src/evdev-mt-touchpad.c
+++ b/src/evdev-mt-touchpad.c
@@ -928,6 +928,7 @@ tp_detect_jumps(const struct tp_dispatch *tp, struct tp_touch *t)
 static void
 tp_process_state(struct tp_dispatch *tp, uint64_t time)
 {
+	struct evdev_device *device = tp->device;
 	struct tp_touch *t;
 	unsigned int i;
 	bool restart_filter = false;
@@ -953,7 +954,8 @@ tp_process_state(struct tp_dispatch *tp, uint64_t time)
 		if (!t->dirty)
 			continue;
 
-		if (t->pressure_delta < -7)
+		if ((device->model_flags & EVDEV_MODEL_LENOVO_T450_TOUCHPAD) &&
+		    t->pressure_delta < -7)
 			tp_motion_history_reset(t);
 
 		if (tp_detect_jumps(tp, t)) {
-- 
2.7.4